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          【MyBatis入门_04】之 SqlMapConfig.xml 配置文件小结
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        <p>这一篇主要总结一下 SqMapConfig.xml 配置文件中常用标签的使用。</p>
<h3 id="properties"><a href="#properties" class="headerlink" title="properties"></a>properties</h3><p>采用properties 标签配置时主要有两种方式，例如在配置数据库的时候，基本都是把配置固定写死在enviroments 中了，显然这是不利于维护的，因此我们可以采用 properties 标签来配置属性。<a id="more"></a></p>
<h4 id="第一种"><a href="#第一种" class="headerlink" title="第一种"></a>第一种</h4><p><img src="https://gitee.com//xizhongren8980/BlogImages/raw/master/imgs/20200606213500.png" alt="image-20200606213457843"></p>
<p>这一种有点多余的感觉，基本不用</p>
<h4 id="第二种"><a href="#第二种" class="headerlink" title="第二种"></a>第二种</h4><p>通过properties 的 resource 属性来加载数据库配置文件。</p>
<p>首先是在类路径下定义一个数据库配置文件 db.properties</p>
<figure class="highlight ini"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">jdbc.driver</span>=com.mysql.cj.jdbc.Driver</span><br><span class="line"><span class="attr">jdbc.url</span>=jdbc:mysql://localhost:<span class="number">3306</span>/mybatis?useSSL=<span class="literal">false</span></span><br><span class="line"><span class="attr">jdbc.username</span>=root</span><br><span class="line"><span class="attr">jdbc.password</span>=<span class="number">123456</span></span><br></pre></td></tr></table></figure>

<p>然后编辑 properties 标签的 resource 属性值。</p>
<p>resource 属性用于指定配置文件的位置，需要按照类路径的写法来写，并且必须存放于类路径下。</p>
<p><img src="https://gitee.com//xizhongren8980/BlogImages/raw/master/imgs/20200606214534.png" alt="image-20200606214531597"></p>
<p>其中在 “${}” 中填写的值就是我们定义的 db.properties 文件里面的 key 值，需要对应上，这个细节要注意一下。这种方式更加灵活，方便维护，推荐使用。</p>
<h3 id="typeAliases"><a href="#typeAliases" class="headerlink" title="typeAliases"></a>typeAliases</h3><p>在 dao 接口中我们会定义很多的 statement，而这些 statement 需要使用 parameterType 来指定输入参数的类型，使用 resultType 来指定返回结果类型，这个时候使用类的全限定类名有时会很长，不利于开发。因此我们可以使用 typeAliases 标签来配置 domain 包下类的别名。其实之前我们在使用基本类型的时候就是用的别名，这是因此 mybatis 帮我们把基本类型都注册了别名。</p>
<p><img src="https://gitee.com//xizhongren8980/BlogImages/raw/master/imgs/20200606220135.png" alt="image-20200606220132574"></p>
<p>使用 typeAliases  可以配置 domain 包下的类的别名，同时也只能配置 domain 下类的别名。</p>
<p>例如对 Book 配置别名</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--用于配置别名，只能配置domain下类的别名--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!--type属性指的是实体类的全限定类名，alias属性指定别名，当指定了别名就不区分大小写--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">typeAlias</span> <span class="attr">type</span>=<span class="string">"com.xizhongren.domain.Book"</span> <span class="attr">alias</span>=<span class="string">"book"</span>&gt;</span><span class="tag">&lt;/<span class="name">typeAlias</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>那么我们在接口的映射文件中就可以直接写类名的别名</p>
<p><img src="https://gitee.com//xizhongren8980/BlogImages/raw/master/imgs/20200606221024.png" alt="image-20200606221022992"></p>
<p>但是这个时候就会有新问题，在实际项目中，实体类数量肯定是不少的，要是只能一个一个定义，那岂不是当场崩溃。所以贴心的 mybatis 提供了批量别名的定义。</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!--用于指定要配置别名的包，当指定别名之后，该包下的所有实体类都会自动注册别名，并且别名就是类名，不区分大小写--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.xizhongren.domain"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h3 id="Mappers"><a href="#Mappers" class="headerlink" title="Mappers"></a>Mappers</h3><p>与typeAliases标签类似，配置mappers时也有 package标签可供使用。</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!--package标签用于指定 dao接口所在的包，当指定了之后就不需要写mapper标签以及它的resource属性和class属性--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">"com.xizhongren.dao"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>当然了，配置文件里还有很多其他的一些标签配置，等涉及到时再作相应的介绍吧。</p>

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